IE version data

Chart notes

The chart shows every months worth of percentage take up for IE browsers 4 through 7 in the whole browser market.

I've included markers in the chart to highlight the launch of each new browser (from IE5 onwards).

There looks like there may have been a data correction for IE7 around February 2007 which could explain the large dip. Nothing particularly important happened during that period on the browser timelines.

What does this show?

IE6s lengthy exposure to the market means that it's in more households that previous, and current incarnations of IE.

When Microsoft bring out a new browser, it does gradually replace the previous browser.

If you compare the progress of adoption when IE6 came out to when IE7 came out, they're near the same. The difference is the previous browser's adoption and it's impact on these figures.

I believe the adoption of IE7 is not a great as IE6 (see period Aug 2001-Aug 2002 and Jul 2006-Jan 2008) will be due to greater choice of browsers on the market today - Firefox starts to have a significant market share in 2006.

Conclusion

Generally, your normal user (i.e. not the techies) will upgrade their browser if it's forced upon them. This is either through forced updates from Microsoft, or, more likely in my opinion: PC upgrades.

New PCs mean new browsers, and if you buy a machine today you'll have IE7. In a year, if you buy a PC you'll have IE8 - and that's where the real take up will happen. Since PCs are getting cheaper and more powerful (as they keep doing over the years), PC turnover increases.

Sure Microsoft will advertise IE8, and this will encourage change, but I believe PC turnover will be one of the greatest factors driving the market shift.

My prediction

Depending on your views, a browser below x% of the market does not have to be supported. For me, this is any browser below the 10% mark. If it's a standards based browser, then my layout will work anyway (I'm looking at you Safari).

From this data, I'm predicting that by 2010 IE6 will have a small enough market share to be ignored.

That said, by then, we should be on Firefox 4-5, IE10 IE9-beta and Safari 5.

Sure, 2010 is pretty far away right now, but it'll be here before you know it.

The bottom line is, as developers and designers, if we want to support the majority of users, we're going to have to support all the latest browsers, and for the big boys, Microsoft in particular (though if Google enter that market we could have another big boy on our hands) - we're going to have to support all the stupidlittlequirks for last 3 revisions of the browser.